Secondary battery

Abstract

A secondary battery including: a case including an opening; a top cover assembly including a top cover plate covering the opening and an electrode terminal, the top cover plate including an electrode lead-out hole corresponding to the electrode terminal; an electrode assembly received in the case and including a main body and a tab, the tab being bent relative to a thickness direction of the top cover plate to form a bent portion; and a current collecting wiring board disposed between the top cover plate and the main body and including a first connection portion, a second connection portion, and a transition portion, the first connection portion and the second connection portion extending along a width direction of the top cover plate and being provided opposite to each other, the first connection portion being connected with the electrode terminal, and the second connection portion being connected with the bent portion.

What is claimed is: 
     
       1. A secondary battery comprising:
 a case comprising an opening; 
 a top cover assembly comprising a top cover plate and an electrode terminal, the top cover plate covering the opening and comprising an electrode lead-out hole corresponding to the electrode terminal; 
 an electrode assembly received in the case, the electrode assembly comprising a main body and a tab, the tab extending out from a side of the main body close to the top cover plate and being bent relative to a thickness direction of the top cover plate to form a bent portion; and 
 a current collecting wiring board disposed between the top cover plate and the main body, the current collecting wiring board comprising a first connection portion, a second connection portion, and a transition portion connected between the first connection portion and the second connection portion, the first connection portion being connected with the electrode terminal,
 the second connection portion comprising a first plate body and a second plate body each of which is connected to the transition portion, the first plate body being substantially parallel to the second plate body, and 
 after the bent portion of the tab is placed between the first plate body and second plate body, the bent portion of the tab and the second connection portion are bent together to allow the second connection portion becoming substantially parallel to the first connection portion, 
 
 wherein the electrode terminal comprises a connection plate and an electrode column, the connection plate is disposed on a side of the top cover plate facing away from the electrode assembly, the electrode column is connected between the connection plate and the current collecting wiring board, the electrode column comprises a bottom portion, the bottom portion is sandwiched between the top cover plate and the first connection portion of the current collecting wiring board, and abuts against the top cover plate and the first connection portion of the current collecting wiring board, respectively. 
 
     
     
       2. The secondary battery according to  claim 1 , wherein the electrode column comprises an elongation portion connected to the bottom portion, an area of a cross section of the bottom portion is larger than an area of a cross section of the elongation portion, and the elongation portion penetrates through the electrode lead-out hole and is connected with the connection plate. 
     
     
       3. The secondary battery according to  claim 2 , wherein a cross section of the elongation portion is one of oval and square in shape, and a shape of the cross section of the electrode lead-out hole matches a shape of the cross section of the elongation portion. 
     
     
       4. The secondary battery according to  claim 2 , wherein the top cover plate further comprises a first groove, the first groove surrounds a periphery of the electrode lead-out hole and is disposed on a side of the top cover plate facing the electrode assembly, and at least part of the bottom portion of the electrode column is received in the first groove. 
     
     
       5. The secondary battery according to  claim 4 , wherein the secondary battery further comprises a sealing member, the sealing member comprises a body portion which is annular and an annular flange extending outwardly from an circumferential edge of an inner hole of the body portion, the body portion is disposed between the bottom portion of the electrode column and the top cover plate, the annular flange extends into the electrode lead-out hole, and are in contact with the elongation portion of the electrode column and the top cover plate, respectively. 
     
     
       6. The secondary battery according to  claim 5 , wherein the top cover plate further comprises a second groove which is annular, the second groove surrounds a periphery of the electrode lead-out hole and is disposed on a side of the top cover plate facing the electrode assembly, and the body portion of the sealing member is at least partially received in the second groove. 
     
     
       7. The secondary battery according to  claim 1 , wherein the tab is bent around an edge of the second connection portion to form the bent portion, and the bent portion is disposed between the first connection portion and the second connection portion. 
     
     
       8. The secondary battery according to  claim 1 , wherein the first connection portion, the transition portion, and the second connection portion have an integral structure. 
     
     
       9. The secondary battery according to  claim 8 , wherein a first notch is provided on an inner surface at a junction of the first connection portion and the transition portion. 
     
     
       10. The secondary battery according to  claim 6 , wherein the top cover plate further comprises a third groove which is annular, the third groove surrounds a periphery of the electrode lead-out hole and is disposed on a side of the top cover plate facing away from the electrode assembly, and at least part of the connection plate is at least partially received in the third groove. 
     
     
       11. The secondary battery according to  claim 9 , wherein a second notch is provided on an inner surface at a junction between the second connection portion and the transition portion. 
     
     
       12. The secondary battery according to  claim 2 , wherein the tab is bent around an edge of the second connection portion to form the bent portion, and the bent portion is disposed between the first connection portion and the second connection portion. 
     
     
       13. The secondary battery according to  claim 2 , wherein the first connection portion, the transition portion, and the second connection portion have an integral structure. 
     
     
       14. A secondary battery comprising:
 a case comprising an opening; 
 a top cover assembly comprising a top cover plate and an electrode terminal, the top cover plate covering the opening and comprising an electrode lead-out hole corresponding to the electrode terminal; 
 an electrode assembly received in the case, the electrode assembly comprising a main body and a tab, the tab extending out from a side of the main body close to the top cover plate; and 
 a current collecting wiring board disposed between the top cover plate and the main body, the current collecting wiring board comprising a first connection portion, a second connection portion, and a transition portion connecting the first connection portion and the second connection portion, wherein
 the first connection portion is connected with the electrode terminal, 
 the second connection portion comprises a first plate body and a second plate body each of which is connected to the transition portion, the first plate body being substantially parallel to the second plate body, and 
 after a portion of the tab is placed between the first plate body and the second plate body, the portion of the tab and the second connection portion are bent together to allow the second connection portion becoming substantially parallel to the first connection portion. 
 
 
     
     
       15. The secondary battery according to  claim 14 , wherein the first plate body is longer than the second plate body, thereby allowing the first plate body to protect the tab when the tab and the second connection portion are bent together.